Peonies usually get about 2 to 4 feet tall and roughly 3 to 4 feet wide, though tree peonies can reach about 5 to 7 feet tall and wider than standard garden peonies.

Quick Scoop

  • Herbaceous peonies: about 24 to 36 inches tall and wide.
  • Itoh peonies: usually about 30 to 36 inches tall, often with a broad, full shape.
  • Tree peonies: the largest type, often around 5 to 7 feet tall, with woody stems that stay up year-round.

What to expect

Most peonies form a rounded, bushy clump rather than a sprawling plant, so they stay fairly contained in the garden. If you’re planning spacing, giving them about 3 feet of room is a safe rule of thumb for mature growth.

TL;DR: Most peonies stay under 4 feet tall, but tree peonies can grow much larger.